Drilling-machine.



C. H. ANDERSON.

DRILLING MACHINE.

'APPLIGATION FILED APR. 12, 1912.

Patented Aug. 12, 1913.

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DRILLING MACHINE.

APPLICATION FILED APR.12, 1912, 1&695995. Patented Aug. 12,1913.

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C. H. ANDERSON.

DRILLING MACHINE.

APPLICATION FILED APR. 12, 1912.

Patented Aug. 12, 1913.

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APPLICATION FILED APR. 12, 1912,

Patented Aug. 12,1913.

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APPLICATION FILED APR. 12, 1912.

Patented Aug. 12, 1913.

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G. H. ANDERSON- DRILLINGMACHINE.

I, APPLICATION FILE-D Anmz, 1912.

Patented Aug. 12, 1913.

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0. H. ANDERSON.

.DRILLING MACHINE. APPLICATION FILED APR.12, 1912.

Patentad Aug". 12, 1913.

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DRILLING MACHINE.

APYLIOATION FILED, APR.12, 1912.

Patented Aug. 12, 1913;

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C. H. ANDERSON.

DRILLING MACHINE.

APPLICATION FILED APR. 12, 1912.

Lmgggs, Patented Aug. 12, 1913.

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DRILLING MACHINE.

APPLIOATION TILED APR. 12, 1912.

Patented Aug. 12, 1913.

12 SHEETS-SHEETIO.

C. H. ANDERSON.

DRILLING MACHINE.

APPLICATION FILED APR. 12, 1912.

C. H. ANDERSON. DRILLING MACHINE.

APPLIOATION FILED APEJZ, 1912.

Patented Aug. 12, 1913;

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CHARLES H. ANDERS6N:',.OF CINCINNATI, OHIO.

DRILLINGj-MACHINE.

To all whom it may concern:

' Be it known that 1, CHARLES H. ANDER- soN, a citizen of the UnitedStates, residing are formed of heavy channel-beams of great length, towhich numerous parts of the body-framing are to be secured by rivets, itis necessary to carefully lay out and unch or drill large number ofrivet holes 1n the beams, and as the holes mfist be in perfect registerwith those in the parts which are to be riveted ,thereto, great care andskill 4 on the part of those in charge have hitherto been necessary toavoid mistakes. The pracor carriage, shown in the prevlous figures ticein preparing the. work has usually been to either measure off and markthe positions of the holes on each beam, bar or plate, a laboriousprocedure subject to inaccuracy, or to provide a carefully designedtemplet for each part, with attendant labor and expense. It has alsobeen usual in producing the holes to pass the work across a power-.punch or drill and stop and position it for each hole to be formed; butthe handling of heavy beams and'plates in this way is necessarily slowand laborious, and one of-my purposes is to avoid the objectionsincident to this practice-by causing the work to remain-stationary whilethe drilling-tool automatically travels and' ptzsitionsitself for eachoperation.

My improved drilling machine, constructed as herein illustrated, hasbeen devised-by me for use, more especially, in providing rivet-holesinchannel-beam car-sllls. The machine has a frame or bed on which thechannel-beam is positioned, a traveling-head carryinghorizontally-disposed drills for drilling holes in the channel-beamflanges,

and-a traveling-head carrying a vertical drill for drilling holesin thebody or web of the channel-beam. 5 On the frame'are adjust'able stops,adapted to be readily. positionedwith great accuracy along the ath of.;the. ;trayeling liea ds at the locations w ere Specification oilIgetterslatent.

1912. Serial No. 90,423;

Application filed April 12,

enlarge Fig. 1; Fig. 5, a still further enlarged the holes are to bedrilled; and the traveling-heads are [equipped with automatic mechanism,all as illustrated and after described, for causing the heads to travelfrom one end to the other of the beam,

ause' at each location where a hole is to be ormed, and drill the holesduring the pauses. 1 Referring to the drawings Figure 1 is a brokentop-plan view of. the machine show ing a traveling-head carrying drillsadapted cling-head in end elevation; Fig. 3, a'broken -'side view of themachine showingthe same travelin -head in side elevation; Fig. 4, anbroken sectiontaken on line 4 in broken section also taken nearlythroughout on line 4 in Fig. 1, but showing a few Patented Aiig.12,1913.

ereinto operate from opposite sides upon the flanges ofa channel-beam;Fig. 2,. an end- :yiew ofthe machine showing the sam'e'trav-f additionaldetails; Fig. '6, a plan section :taken on irregular line 6 in Fig.7showing features of construction of the starting and stopping. mechanismfor the traveling-head,

; and the drill advancing and retracting iinechanisms carried thereby;Fig. 7, a broken side .view of features illustrated in Fig. 6; Fig. 8, asection taken on line 8 in Figs. 6

and I Fi 9, a broken section on line 9 in -Fig. 6; F1g. 10, an enlargedsection taken on line 10 inFig. 1; Fig. 11, an enlarged ibrokenfsectiontaken on line 11 in Fig. 1,'corresponding with line 11 in Figs. 2 and10; 'Fig- 12, a broken section on line 12 in Fig. =2; Fig. 13, adiagrammatic view, partly in section, of electropneumatic mechanisms,whereby movement of the traveling-head or carriage, shown 1nthOPI'GVIOUS figures, 1s

'icontrolled and the drills are advanced and retracted; Fig. 14, atoplan view of the machine showing the trave in -head, or carriage, forthe vertical drill an .its operating mechanism;-Fig. 15, asection takenon line 15 in Fig. 14; Fig. 16, a section taken on line 16 in Figs. 14and 15; Fig. 17, an enlarged section of details of construction takenon'the same line as Fig. 16; Fig. 18, a vertical section taken on line18 in Figs. 19

and 20 and showing-details of construction of the starting and stoppingmechanism for the traveling-head carrying the vertical :drill, as wellas for bringing about the adjvancement and retraction of the drill; Fig.:19',' a "section taken online 19 n'Fig. 20; W

Fig. 20, a section taken on line in Fig. 18; and Fig. 21, a brokensection taken on line 21 in Figs. 18 and 20.

The bed or frame 25 of the machine may be of a length exceeding that ofthe longest channel-beam 26, or other work, intended to be operatedupon. Extending the full length of the bed are the rails 27 28 and atintervals along the bed, between the rails, are platforms 29 formingfacings for vises which clamp and position the channel-beam. The Visesmay be constructed as illustrated most plainly in Figs. 2, 4, 15 and 16.Each vise has a stationary jaw 30, fastened to the facing 29 by bolts31, and a movable jaw 32 adjustable by means of a screw 33 working in astationary nut 34 fastened to the facing. In each jaw is a removable andreplaceable block 35 forming a seat for the channel -beam and havingshoulders 36 which clamp and position the beam, as shown. prevent wearupon the jaws of the vises and to facilitate positioning of thechannelbeam midway between the rails 27, 28. Where. a relativelynarrower channel-beam than'that shown is to be operated upon,companion-blocks 35 having wider shoulders 36 would be substituted forthose shown, as will be readily understood.

The traveling-head or carriage for the horizontal drills has a frame ortruck 37 on which is fnounted'an electric motor 38. ,The truck issupportediat ohe end upon a pair of groo-ved wheels 39 and at itsopposite end upon a pair of groovedwheels 40, all of which ride upon thetracks 27, 28. The wheels 40 are upon stub-shafts 41 carryinggear-wheels 42 which are driven by gears 43 on a cross-shaft 43 torotate the rollers. On one side of the truck is a shaft 44 having a worm45 which drives one of the gears 43 and shaft 43.

The armature shaft 46 of the motor 38 is provided beyond opposite endsof the motor-casing with pinions 47 each of which drives an idle gear48. The gear 48 on one "through the shaft 43* side is upon a hollowstub-shaft or sleeve 49 (see Figs. 4 and 5) ournaled in the frame.Extending throughthe sleeve 49 and rotatable therein is a shaft 50. Theshaft 50 is also longitudinally movable in the sleeve 49 and carries aclutch-member or disk 51 adapted toengage and release the earwheel, orclutch-member, 48. The sha 50 carries a bevelspinion 52 which is splinedupon the shaft but permits the shaft to be moved longitudinally throughit. The bevel.- pinion 52 engages a. bevel-pinion 53 on the shaft 44.

It is to be understood that when the clutch-members 48, 51 are inengagement, its worm 45 at side and to turn the rollers 40,

to rotate .the gear 43 on t The object of the blocks 35 is to of thethereby to propel the traveling-head, While when. the saidclutch-members are disengaged the traveling-head may come to a pause.The mechanism for producing engagement and release of the clutch-memberswill be explained farther on.

On each side of the frame or truck 37 is an oil-chamber 54, throughwhich extends a bearing-sleeve 55 for'an inner rotary sleeve 56 throughwhich a drill-shaft or spindle 57 extends and to which it is splined, asshown in Fig. 5. Each of the sleeves-'56 carries a gear-wheel 58 driventhe re-- spective gear 48. In the end of each drillshaft 57 is a sockethaving a square base 59 to receive the square end of the shank of adrill 60. drill 60 is a T-slot 61 to whichis attached, by means of'abolt 62, a hanger or guidepiece 63 for the drill 60. The hanger isfitted with a bushing 64 through which the drill passes. The hangers maybe adjusted toward and away from the longitudinal center of the machine,to be suitably near the particular channel-bar 26, their purpose beingto guide and steady the drills close to the work.

Extending the full length of the bed 25 at the outer side of the rail 27is a T-way 65, and for each hole that is to be drilled on that side ofthe channel-beam 26 a stop 66 is provided; the purpose of the stopsbeing to engage and release mechanism on the traveling-head, whichmechanism, as hereinafter explained, effects stoppage and starting ofthe head and advancement and retraction of the drill or drills carriedthereby. Each stop 66 consists of a block hav-' ing a wedge-shaped end(as shown in Fig.

1) and a hole 67 to receive a lug or pin 68.

The stops are initially positioned along the T-way, in accordance tvlthmeasurements as required for properly locating the holes to be drilled,and fastened in place by the nutbolts 69 carried by the blocks. On thetraveling-head, in the position shown, is a cylinder 70 containing aiston 71 having a stem or plunger 72 provided in its end with a V-shapedsocket 73 (shown in Fig. 13 and also by dotted lines in Fig. 6) adaptedto fit over and engage the V-shaped ends of the stops 66 whenregistering therewith. The piston 71 and its stem are held normally inretracted position by a spring 74.

Above the cylinder 70 is a cylinder 75, the

two cylinders being 111 communlcation through an air-port 76. Working inthe cylinder 75 is a piston 77 having a ballbearing swivel-connection 78with' the end drill-shaft or spindle 57. The piston 77, drill-shaft anddrill are held normally in the retracted position indicated by a spring79. Extending from the oil-chamber 54 to the interior'of the cylinder 75is an oil-escape passage 80 governed by an ad- In the frame 37 aboveeach.

mes es justable needle-valve 81. Extending from the oil-chamber to theinterior of the cylinder (see Fig. 12) is an oil-return passage 82containing a check-valve 83 normally seated in the direction of theoilchamber b a spring 84 held in a screwcap 84. Above the cylinder 75 isa cylinder 85 in which works a piston 86 having a swivel connection withthe end of the clutchshaft 50 above described. A spring 87 tendsnormally to move the piston and clutchshaft in the. direction ofproducing engagement between the clutch-members 48, 51. On the oppositeside of the traveling-head is another drill 6O similarly guided andconnected with a piston in a cylinder, 75 (corresponding with thecylinder 75) and connected, in the same way, with an oilchamber orreservoir 54 through an oil-' escape passage, governed by a needle-valve81, and an oil-return passage, similar to the passage 82, containing acheck-valve seated 'by a spring held by the cap 84". As both drill-shaftcylinders and their attendant parts are the same, it is thought that thedescription'which has been suffice for both.

The reference numeral 88 designates a. compressed-air supply-pipe, theform of a rubber hose, leading from an alr-compressor or compressed-airsupplier. (not shown). Extending from the pipe 88 is a pipe, in sections89, 89, the latter having branches 90 and 91 communicating,respectively, with the cylinders 75 and 85, as indicated most plainly inthe diagrammatic view (Fig. 13).

v A pipe, in sections, 92 and 92*, extends from the pipe 88 to thecylinder 7 5. Interposed between the pipe-sections 89, 89 is an electricvalve 93, detailed in Figs. 10 and 11. In the valve-casing is anelectro-magnet 94 having a core 95 through which extends a valvestem 96carrying an armature 97. On the stem 96 is a valve 98, which controlscommunication between the pipe-sections 89, 89 and a valve 99 whichopens andcloses communication between the pipe-section 89 and anexhaust-port 100. A spring 101 tends normally to raise the stem andarmature and thus normally close the valve 98 and open the valve 99. Theelectro-magnetic valve'93;

illustrated is of known construction. When the magnet is energized itcauses the armature 97 to be drawn down to seat the valve99:

and open the valve 98. Interposed between the pipe sections 92, 92 is anelectric valve 93 in every way similar both in construction andoperation to the electric valve '93.

Referring to Fig. 13, the numerals 102, 103 designate the lead wires ofan electric circuit. The wire 102 has a branch 104 extending through thewinding of the electric valve 93 to a terminal 105. The wire 102has'another branch 106 extending through the winding of the electricvalve '93 to a given of one will terminal 107. The wire 103 extends tothe terminals 107. The companion-terminals 105, 105 are above thecompanioh-terminals 107, 107*, all of the said terminals being insulatedand attached to a bracket 108 carr ed by a bearing-bracket 109 on theunder side of the oil-reservoir 54. The bear ing-bracket 109 has asquared opening 109 through it for a squared portion 72 of the plungerstem 72. ,On the bracket 108 is a vertical boss 110 (see Fig.7) carryinga downwardly extending pin 111 on which are mounted an upperswitch-lever 112 and a lower switch-lever 113. Theswitch 112 is adaptedto make contact with and close the terminals'105, 105, and the switch113 is adapted to make contact with and close the terminals 107, 107. Aspring 114 (Figs. 6 and 8) tends normally to draw the switch 112 awayfrom the terminal 105 to thus break the circuit, and a similar spring115V performs the same ofiice for the switch 113.

Pivoted upon the end of the switch or lever 112 isalatch 116 having ahook-portion 1171 and a finger-portion 118. A spring 119 carried by thebracket 108 and connected with thelatch 116 tends to swing the latter atits hook-portion 117 in the direction to the leftin Fig. 6, whereby thehook would engage the pins 68.

The numeral 120 designates a latch in every way similar to the latch 116and in a plane below the latter, pivoted upon the end portion of theswitch ojrlever 113 and having a spring 121 opera 'ng in-the same way asthe spring 119. T e latch 120 has a hook-portion 122, similar to thehook 117, and a finger-portion 123 similar to the finger-portion 118 ofthe latch 116. Extending downward from the bracket 108 is a hangerportion 124 (Figs. 4 and 9) forming a guide for a plunger-rod 125 whichat its outer end is connected with the lower end. of a lever 126 whichat its upper end is bifurcated (as shown in Fig. 3) and loosely embracesa rod 127 carried by the piston 77, before described. On the rod 127 isan adjustable stop 128. The lever 126 is fulcrumed between its ends on abracket 129 carried by the head of the cylinder 7 0, and a spring 130tends normally to swing the lever to the position indicated in Fig. 4to' thrust the rod 125 until a stop thereon, 131. contacts with thebearing 124. At its inner end the rod 125 has a T-shaped head 132, onearm of which is adapted to engage the finger 118 of the latch 116 andthe other arm of which is adapted to engage the finger 123 of the latch120.

Preliminary to the operation of the machine, the attendant will positionthe stops 66 along the. T-way 65 so that a stop will occur at eachposition where a hole is to be bored on that side of the channel-beam26' when the latter is placed in position and clamped by the vise-jaws30, 32. In the present machine, which is intended to operate moreespecially on channel-bar car-sills, the work may be so laid out thatthe holes to be provided in the opposite channel-bar flanges willregister with .each otiher, and where more holes are to be provided inone flange than in the other, wherever two holes occur, they will be inline with each other.

The channel-bar 26 is positioned upon the bed-frame with the flangewherein the reater number of holes are to be drilled t the side nearestthe rail 27, and at whatever stop a hole is to be drilled only in theadjace'ntchannehbar flange a short pin is laced in the hole of the block66, to extend 1nto the path of the latch 116 only, while where' holesare to be drilled simultaneously in opposite sides of the channel-bar along pin 68 is placed in the block 66 to extend across the path of boththe latch 116 and the latch 120, as indicated in Fig. 7

(where the dotted line 68 indicates the when holes are to be drilledfrom opposite sides, into the path of the hook-portions of both thelatches 116, 120. W'hen the hook portion 117 of the latch 116 contactswith a pin 68 further movement of the carriage causesthe latch to bedrawn longitudinally into the position indicated in Fig. 6; and inmoving to that position it swings the switch-lever 112 against theresistance of the spring 114 into the position where it makes contactwith both terminals, 105 and closed through the contacts 105, 105-the'magnet in the electro-magnetic valve 93 is energized to attract thearmature 97,0pen

the valve 98 and close the valve 99, causing compressed air to flowfromthe pipe-section 89 to the pipe-section 89 and into the cylinders85, 75, 70. This flow, of compressed air to the cylinders starts just asthe V-shaped socket 73 of the plunger 72 is opposite a V-shaped block orstop 66. As the oil in the cylinders 75, can escape but slowly itoperates as a checkto the advance of the drills; therefore as compressedair enters the difierent cylinders it will cause the piston 86 todisengage the clutch-members 48, 51 and move the piston 71, to cause theplunger 72 to engage the stop 66, before the piston the work. Thedisengagement of the clutch- At the moment the circuit is thus- 77advances the rotating drill to chine it moves from point to point alongthe oles aoeaees members 48, 51 causes propulsion of the traveling-headto cease and the engagement of the plunger 7 2 with the block 66 solocks the head, as it stops, that the drill 60 will be properlypositioned for drilling the hole;

In practice, the release of the clutch members takes place before theplunger 72 engages the respective block 66, and in said engagement thesliding of the wedge-shaped socket 73 along the tapering block effectsaccurate positioning of the drills with reference to the work. Thedrills 60 are of high-speed steel and are rotated at highspeed; and as ameans for controlling the pressure and speed of advance of the drillswhile drilling, the oil-passage 80 is provided at the cylinders 75, 75.The speed of escape of oil from a cylinder, under piston pressure, tothe adjacent oil-chamber 54: is governed by the needle-valve 81, and thelatter may be readily adjusted to properly control the feed of thedrills with reference to their speed of rotation and to the air-pressureapplied. The retardation of the piston 77 produced by the more or lessslowly escaping oil, not only causes the drill .to advance at desiredspeed, but prevents the drill and attendant-parts from jumping forwardwhen the drilling of the hole is completed. In the sleeve 55 is a seriesof and in the sleeve 56 is a perforations, 55, coincident series ofperforations 56*, through which the rotating parts are lubricated. Asthe drill nears the end of its working thrust, the stop 128 on the rod127 contacts with the lever 126 and swings the same on its fulcrum,causing the rod 125 to engage at its T-head 132, with the latches 116,120 and withdraw them out of engagement with the pin 68. When thelatches are freed from the pin 68 the springs 114, 115' operate to turnthe switch-levers 112, 113, breaking contact between the terminals 105,105 and between the terminals 107 and 107,

thereby deenergizing the magnetic-valves 93, 93 and permitting theirsprings 101 to close the valves 98 and open the valves 99, to exhaustthe cylinders. The return of the pistons may be so timed, in operation,that the drillswill first be withdrawn from the holes they-have made,and immediately afterward the traveling-head will be freed from the stop66 and the clutch-members will engage and cause the traveling-head tomove to the next stop, where the drilling operation is repeated. In theoutwar movement of the pistons 77 to withdraw the drills from the holes,oil passes freely from the oil-chambers to the cylinders through thepassages 82 by unseating. the valve 83, permitting quick withdrawal ofthe drills by the springs 79. Thus, when the traveling-head is startedfrom one end of the mabed-frame and channel-bar and drills in the latterin rapid succession and with great accuracy. Furthermore, when oncestarted the operations areautomatic until the traveling-head is stoppedat the opposite end of the bed-frame.

The vertical drill, illustrated in Figs. 14 to 21 inclusive, operates toall intents and purposes like the drills on the. travelingheaddescribed. The traveling-head or carriage for the vertical drillconsists of a frame or truck 150. Mounted on the truck is an electricmotor 151 and the truck travels upon the grooved wheels 1554, one ofwhich .is driven from the motor shaft 153 through a bevel-gear 154meshing with a bevel-gear 155,0n a vertical shaft 156 carrying a sleeve157 having a peripheral Worm 157 meshing with a gear, 158, on thegrooved driving wheel 152. The mechanisms for producing starting'andstoppage cf the traveling-head 150, and for advancing and retracting thedrill carried thereby, operate, to all intents and purposes, like thecorresponding mechanisms provided uponthe traveling-head 37, beforedescribed, except that the fact that the drill works verticallynecessitates a modification in the arrangement and disposition ofparts,J ournaled on the truck isa shaft 159 carrying a belt-pulley 160-drivenby a belt or chain 161'from a pulley 162 on the motor armature-shaft153. The vertical drill cylinder 163 is mounted on ahorizontally-extending dovetail guide 164 so that it may be moved todifferent positions in the direction transversely of. the machine, asindicated by full and dotted lines in Fig. 15. It may be moved beyondone side of the bedframe and may be locked in any location upon thetraveling-head by means of set- 40 screws 165, in a common manner, whichit is not thought necessary to detail in the draw: m l u gs. I Thecylinder 16.3 corresponds with the cylinder 75, before described, andcontains a 5 piston 166 to which is swiveled the drill-' shaft 167carrying the drill 168.'. Above-the cylinder 163 is an oil-chamber 169from which extends a passage 170 for oil to the cylinder-163. In thepassage 170 is a' check- 5 valve 171 which -ma open downward against theresistance of but is prevented from entirely closing by an adjustablescrew 173.

In the downward movement of. the piston 166 to advance the- 5 drill, theoil is squeezed upward through the passage, 170 and small opening at thevalve 171, while in the upward movement of the piston 166 toretract thedrill oil is drawn freely through the passage 170 to the cylineo der 163by opening the check-valve 171. On the truck 150 is a cylinder 174containing a piston 175 on a stem or plunger-rod 176. These partscorrespon ing to all intents and purposes with the cylinder 70, piston71 and rod 72, before described. Also on the truck a light spring 172,

204 being provided as is an electro-magnetic valve 177, correspondingwith the valves 93, 93 described, interposed between a compressedair-supplylng pipe 178 and a pipe 179 leading to the cylinder 174, and abranch pipe 179" leading to the cylinder163. At the outer side of therail 28, and extending the full length of the bedframe, is a T-slot 180along which are positioned blocks or steps 181, the same being securedin adjusted position by means of the headed bolts 182. On the outer endof each block 181 is an upwardly extending V- shaped-projection 183. Inthe lower square end-portion 176 of the rod 176 is a V- shaped socket184 adapted to engage the stop-projections 183, as plainly indicated inFig 18. The squared portion 176 of the rod 176 works through a squaredopening in a bearing-plate 185' secured to the traveling-head. Securedagainst the plate 185 is a bracket 186, carrying a pair of electriccontacts 187 which are interposed in an electric circuit (not shown) ofwhich 188 is a lead-wire, and provided at its lower end with ahorizontal bearing-boss or sleeve 189 fittedwith a bolt or bearing-stud190. J ournaled onthe stud 190 is a switch-lever 191 having a headadapted to slide against and close the contacts 187', an arm connectedthrough a spring 193 with the bracket 186. and an arm 194 on which ispivoted a latch 195. held normally in raised position by a spring 196.Working through an eye-piece 197 secured to the bracket 186 is avertically extending plunger-rod 198 having a foot 199; and on the freeend-portion of the latch .195 is a later ally-extending pin 195 in thepath of the foot 199. Journale'd at opposite ends in bearings 200,toward opposite ends of the truck, is a squared rock-shaft 201 carryingan arm 202 pivotally connected at its opposite end to a bearing-piece203 on the rod 198 and also carrying similar bifurcated fingers 204, oneadjustable longitudinally of the shaft at one side of the arm 202 andthe other adjustable along the shaftat the opposite side of said arm.The purpose of the fingers 204 is to extend under and into the path ofthe drill-shaft 167, as most .plainly indicated in Fig. 16; two fingersshown, so that one may be in the path of the drill-shaft when the drilland 1ts cylinder are adjusted at one side of the arm 202, and the otherone 120 may be in the path of the drill-shaft when the drill-cylinder ismoved to the other side of the arm 202. I I

The sleeve 157 (shown in Fig. 16) is normally loose up0n the shaft 156,but the said shaft and sleeve are provided with companion clutch-members205 which when in engagement cause the sleeve to be rotated by theshaft. Pivoted upon a bracket 206 carried by the truck is aclutch-shipping lever 207 which at one end engages the (shown in Fig.18),. an

sliding member of the clutch 205 and at its opposite end enters a slot208 (see Fig. 15) in the plunger-rod 176. In'practice, the stops orblocks 181 are initially positioned along the T-slot 180 and tightenedin place wherever the drill is to be actu-' ated. When the electricmotor 151 is started it drives the shafts 156 and 159 continuously and,the rod 176 being normally raised by the spring 17 5 (shown in Fig.'15), the clutch-lever 207 is in the position of causing engagementbetween the clutch-mem hers 205, sothat the sleeve 151 and worm 157 turnto propel the carriage, or traveling-head, along the track. The blocks181 are in the 'patn of the latch 195, when the latter isin its normallraised position when-the latch engages a stop it is drawn to theposition shown in Fig. 18, swinging the switch-lever 191 to close thecircuit through the contacts 187, excite the electro-magnet in thevalve-device 177 and cause compressed air to be directed thereby intothe cylinders 17 4, 163. The efiect of exciting the electro-ma neticvalve 177 is to cause the compresse air entering the cylinder 174 topress down the piston 175 and rod or plunger 176 to cause the latter atits V-shaped end to engage the V-shaped projection 183 and position andlock the traveling-head. In the descent of the rod 176 it swings theclutchshipping lever 207 to disengage the clutchmembers 205 and releasethe carriage-driving means. Following the stopping and positioning ofthe carriage, or traveling-head,

the compressed-air entering the cylinder 163- presses down the piston166, and drill-shaft 167 and vfeeds the drill 168. As shown in Fig. 16,the drill-shaft is driven constantly through a worm 159, on. the shaft159, which meshes with a worm 167, on the drill-shaft s1eeve167 theconstruction of which is substantially the same as the sleeve 56 shownin Fig. 5. The downward movement of the drill is governed by the escapeof oil from the cylinder 163' to the oil-reservoir 169 through'theregulating-valve 171, which operates in substantially the same way asthe regulating-valve 81 before described.

To prevent'the accumulation of air in the cylinder 163, beneath thepiston 166,1 pro videthe stem 167 with an extension 167 which extendsthrough the piston and works through an opening in the base oftheoilchamber 169. Extending fromthe underside of'the piston through thestein-extension 167? to the upper .end thereof is a ventpassage 209containing an upwardly closing Y check-valve 210 which, when open, restson c a cross-pin 211. This check-valve is,closed,

. inthe down-stroke of thepiston, by the upward pressureof the oil inthe cylinder 163,

electro-magnetic valve, thereby causing the same to shut off the air tothe cylinders 174, 163 and permit the cylinders to exhaust. In theexhausting of the cylinders the drill is raised from the work by thespring 166** and the spring 17 5 acts to raise the rod 176, to releaseit from the stop 183, and swing the clutch-lever t6 cause theclutch-members to engage and the carriage to travel forward to the nextlocation, where the opera tion is repeated.

To steady the traveling-head 37 in its movement along the bed-frame andprevent lateral play thereof, under the. thrust of the drills, I providebearing-projections 37 on the headwhich slide against the inner sides ofthe track-rails 27, 28; and for the purpose of steadying thetraveling-head 150 the same is equipped with brackets 150 on one side,riding at their ends under and against the T-way 65, and with a bracket150 on the opposite side having a 'V-shaped bearing engagement wit theunder side of the T-way 180. The p unger 72 with the projections 37*,and the plunger 176 with the brackets 150, form each a three-point.engagement with the bed-frame. As they clamp the latter they bring thetravelinghead to a stop, without material jar, and insure accuratepositioning thereof at rightangles to the frame for each drillingoperation.

One of the great advantages of my improved drilling-machine lies in theease and accuracy with which the relative ositions of the holes to bedrilled may be laid. out. Each block 66 has a central mark on its surface,and when the first block ispositioned the others may be accuratelylocated by measurements taken therefrom with a tapemeasure. Where aplurality of similar channel-beams 26, or other pieces of work, are tobe similarly prepared an operator in authority may lay out the holes, byproperly positioning the stops in the T-ways, and leave the rest withsafety to the care and intelligence of an ordinary workman. In practice,the traveling-heads and parts carried thereby may weighcomparatively'little, require but little power to propel them rapidlyfrom point to point along the bedframe, be started and stopped quicklyand without jar, and be accurately positioned too of a stationary frameand means thereon at each pause by the engagement of the plunger-rodswith the V-shaped stops; while the channel-beams, or other pieces ofwork, are often veryheavy and unwieldy to handle. Thus my improvedmachine when once started, not only drills the holes throughout thework, automatically, quickly and accurately, but requires comparativelylittle power to run it and but little, if any, attention during itsoperation.

It is very desirable in practice that the feed of each drill shall becontrolled with reasonable accuracy in accordance with its speed ofrotation and the air-pressure. This is accomplished in the present.machines by the oil-check mechanisms described, which may be readilyadjusted to properly retard the escape of oil back to the oil-chambers,while permitting rapid flow of oil to the drill-piston cylinders, andconsequent'quick retraction of the drills, after each drillingoperation.

The fore oing description is intended t convey a clear understanding ofmy improvements, in what I now believe to be the best form of theirembodiment, and no un due limitation should be understood there from.

What I claim as new and desire to secure by Letters Patent is 1. In adrilling-machine, the combination of a frame and means thereon forholding the work in a stationary position, adjustable stops on theframe, a traveling-head movable upon the frame, propelling means for thehead and drill, drill-rotating means, drill-advancing means anddrill-retracting means, all carried by the head, a stop-engaging latchon the head and means actuated by movement of the latch for stoppingsaid drill. a

2. In a drilling-machine, the combination propelling means and advancingthe for holding the work in a stationary position, a traveling-head andmeans for moving it upon the frame along the work, a drill anddrill-rotating means carried by said head, stops upon the frame atdifferent points along the work in the path of move ment 'of the head,stop engaging and releasing mechanism on the head, and drill-advancingmeans actuated by engagement of said mechanism with a stop.

3. In a drilling-machine, the combination I of a frame, and meansthereon for holding the work in a stationary position, a traveling-headon the frame, stops adjustablev along the path of the head to thepositions,

with reference to the work, where the drilling operations are tooccur,propelling means for the head, a drill, drill-rotating means,drill-advancing means and drill-retracting means, all carried by thehead stopengaging and disengaging latchmechanism on the head,mechanisms, actuated by the ening-head on the frame, stops adjustablealong the path of the head to the positions, with reference to the work,where the drilling operations are to occur, propelling means for thehead, a drill, drill-rotating means, drill-advancing means anddrill-retracting means, all carried by the head, stopengaging anddisengaging latch-mechanism on the head, locking means upon the headoperating when moved into register with a stop to engage the same,mechanisms, actuated by the engagement of the latch-mechanism with astop, for stopping the said propelling means, operating the said lockingmeans, to lock the head in position, and actuating the drill-advancingmeans, and mechanism actuated by the final advance movement of the drillto retract the latter, release the lock and mechanism from the sto andstart the said propelling means.

5. In a drill-machine of the character described, the combination of awork-holding frame, an intermittently movable travelinghead on theframe, a drill, drill-rotating mechanism, electro-pneumaticdrill-advancing and retracting .mechanism, and head starting, stoppingand positioning mechanisms all carried by the head, and adjustable stopson the frame, in the path of said head, operating to stop and thenrelease the head and to actuate said electro-pneumatic mechanism duringeach pause of thehead, for the purpose set forth.

- 6. In a drilling-machine, the combination of a frame for holding thework in a stationary position, a traveling-head with means for moving itupon the frame along the work, adjustable stops on the frame, a rotatingdrill on the head, advancing and retracting mechanism for the drill,mechanism for starting and stopping the travel of the head, astop-engaging latch on the head, mechanism for locking the head to andunlocking it fromthe frame, and electropneumatic means upon the head,controlling the operations of said mechanisms, actuated by engagement ofthe latch with a stop to cause the head to pause, then to position andlock the head to'the frame, then to advance and retract the drill, thento unlock the head from the frame and then to start travel of the head.

7. In a drilling-machine of the character described, the combination ofa work-holda noiseless ing frame, an intermittently movabletraveling-head on the frame, a plurality of drills,

with rotating means and advancing and retracting means therefor on thehead, and stops on the frame in the path of the head adjustable toregulate the intermittent moven'ient of the head and the operation ofone or more of the drills during the pauses of the head, for the purposeset forth.

8. In a drilling-machine, the combination of a cylinder, piston in thecylinder, drillshaft connected with the piston, turning means for thedrill-shaft, a compressed-air supplier, means for directingcompressedair from the supplier into the cylinder to advance the pistonand drill-shaft, means for retracting the piston and drill-shaft, anoilchamber communicating with the cylinder, oil-check mechanism,operating to retard the flow of oil from the cylinder to'the chamber, inthe advance of the piston, thereby controlling the feed of thedrill-shaft, and

purpose set forth.

9. In a drilling-machine of the character described, the combination ofa 'work-holding frame, a traveling-head on the -frame,

head engaging andreleasing stops on the frame, a plurality of drills onthe head, propelling means for the head,-drill-rotating means,electro-pneumatic advancing mechanism, and retracting means for eachdrill on the head, a separate actuating latch on the head for each ofthe said electro-pneumatic mechanisms, the latches being in differentplanes, and removable and replaceable pins on the frame each extendinginto the.

path of one or more of said latches, for-the purpose set forth,

CHARLES H. ANDERSON. In presence o f R. A. RAYMOND, 'R. A. SGHAEFER.

